How to debug C++ program in VSCode with file added

I work fine with debugging without adding a file, however, I do not know how to deal with it with file added.

The commands are as follows:

g++ -g --std=c++11 lab1.cpp -o lab1

./lab1 ./tests/extracredit-test-0.txt

The following are my task.json and launch.json. I wonder how to modify it to support debugging with the file added.

launch.json

{  // Use IntelliSense to learn about possible attributes.  // Hover to view descriptions of existing attributes.  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387"version": "0.2.0","configurations": [    {"preLaunchTask": "build active file","name": "CodeLLDB","type": "lldb","request": "launch","program": "${fileDirname}/${fileBasenameNoExtension}","args": [],    },    {"preLaunchTask": "build active file","name": "(lldb) Launch","type": "cppdbg","request": "launch","program": "${fileDirname}/${fileBasenameNoExtension}","args": [],"stopAtEntry": false,"cwd": "${workspaceFolder}","environment": [],"externalConsole": false,"MIMode": "lldb"    },    {"name": "GDB","type": "cppdbg","request": "launch","program": "${fileDirname}/${fileBasenameNoExtension}","cwd": "${workspaceFolder}","MIMode": "gdb"  }  ]}

task.json

// Available variables which can be used inside of strings.// ${workspaceRoot}: the root folder of the team        // ${file}: the current opened file                     // ${fileBasename}: the current opened file's basename // ${fileDirname}: the current opened file's dirname    // ${fileExtname}: the current opened file's extension  // ${cwd}: the current working directory of the spawned process{"version": "2.0.0","tasks": [    {"label": "build active file","type": "shell","command": "g++ --std=c++11 ${file} -g -o  ${fileDirname}/${fileBasenameNoExtension}","group": {"kind": "build","isDefault": true      },"presentation": {"echo": true,"reveal": "always","focus": false,"panel": "shared"      },"osx": {"command": "g++ --std=c++11 ${file} -g -o  ${fileDirname}/${fileBasenameNoExtension}",      },"windows": {"command": "g++","args": ["-ggdb","\"${file}\"","--std=c++11","-o","\"${fileDirname}\\${fileBasenameNoExtension}\""        ]      }    }  ]}